On Sun, 08 Oct 2006 16:57:46 +0200
Tony Grant <tony at tgds.net> wrote:
> I have looked at it a couple of times (not really my thing...) on
> DVB-S and it was a normal channel back then. Can't check right now
> I'm moving and won't have TV for three weeks.
Last time I looked (a couple of years) at BBC parl on DVB-T, the beeb
were broadcasting it in quite an interesting way..
There's a hidden stream on the same mux as BBC FOUR + Radio 5, 6,
7,1xtra etc. which is not advertsed in the SDT.
Its video stream is a normal 720x576 frame: but laid out something like
--------------------------------
| -------- |
| | B | |
| | | |
| ------------| -------- |
| | | |
| | A | -------- |
| | | | C | |
| | | | | |
| ------------- -------- |
| |
--------------------------------
Area A is the video for BBC PARLIAMENT, whilst B and C are the 'News
Multiscreen' feeds.
Clever use of MHEG overlaid graphics then allows one actual MPEG stream
to supports a TV channel and an interactive service.
The rest of the frame is pure black.
Cheers,
Gavin.